In lieu of the assessments to defray the costs of formulation, issuance, administration, and enforcement and advertising or sales promotion provided for in Section 58921, if the marketing order contains provisions for advertising or sales promotion as authorized in this chapter, the director may approve and fix an assessment for producers and an assessment for handlers as the case may be, not exceeding 612 percent of the gross dollar volume of sales of such commodity by all producers, or by all processors, distributors, or other handlers of such commodity regulated by such marketing order during the marketing season during which such marketing order is effective. The method and manner of assessment and collection of such assessment, and the limitations and restrictions applicable thereupon, shall conform in all respects with the provisions of this article regarding assessments for advertising and sales promotion, except as to the maximum amount of such assessment.